Multi-scale magnetic mapping of serpentinite carbonation

Masako Tominaga (), Andreas Beinlich, Eduardo A. Lima, Maurice A. Tivey, Brian A. Hampton, Benjamin Weiss and Yumiko Harigane
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Masako Tominaga: Texas A&M University
Andreas Beinlich: Curtin University
Eduardo A. Lima: Massachusetts Institute of Technology
Maurice A. Tivey: Woods Hole Oceanographic Institution
Brian A. Hampton: New Mexico State University
Benjamin Weiss: Massachusetts Institute of Technology
Yumiko Harigane: The National Institute of Advanced Industrial Science and Technology

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Peridotite carbonation represents a critical step within the long-term carbon cycle by sequestering volatile CO2 in solid carbonate. This has been proposed as one potential pathway to mitigate the effects of greenhouse gas release. Most of our current understanding of reaction mechanisms is based on hand specimen and laboratory-scale analyses. Linking laboratory-scale observations to field scale processes remains challenging. Here we present the first geophysical characterization of serpentinite carbonation across scales ranging from km to sub-mm by combining aeromagnetic observations, outcrop- and thin section-scale magnetic mapping. At all scales, magnetic anomalies coherently change across reaction fronts separating assemblages indicative of incipient, intermittent, and final reaction progress. The abundance of magnetic minerals correlates with reaction progress, causing amplitude and wavelength variations in associated magnetic anomalies. This correlation represents a foundation for characterizing the extent and degree of in situ ultramafic rock carbonation in space and time.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01610-4

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DOI: 10.1038/s41467-017-01610-4

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